1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58coatings of aluminium Specification and test methodsICS 25.220.40Metallic coatings Physical vapour-
2、deposited BRITISH STANDARDBS ISO 22779:2006BS ISO 22779:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 December 2006 BSI 2006ISBN 0 580 49822 0Amendments issued since publicationAmd. No. Date Commentscontract. Users are responsible fo
3、r its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.National forewordThis British Standard was published by BSI. It is the UK implementation of ISO 22779:2006. The UK participation in its preparation was entrusted to Technical Committee STI/33,
4、Electrodeposited and related coatings.A list of organizations represented on STI/33 can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a Reference numberISO 22779:2006(E)INTERNATIONAL STANDARD ISO22779First edition2006-11-15Metall
5、ic coatings Physical vapour-deposited coatings of aluminium Specification and test methods Revtements mtalliques Revtements daluminium appliqus par vide Spcification et mthodes dessai BS ISO 22779:2006ii iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Terms and d
6、efinitions. 2 4 Information to be supplied by the purchaser to the processor . 2 5 Designation . 3 6 Requirements 5 7 Sampling 9 8 Rejection 9 Annex A (informative) Additional information concerning equipment, substrate preparation and process parameters 10 Annex B (normative) Determination of the a
7、verage thickness of aluminium coatings 12 Annex C (normative) Adhesion test methods . 13 Annex D (normative) Sampling. 14 Bibliography . 15 BS ISO 22779:2006iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies)
8、. The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non
9、-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part
10、 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting
11、a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 22779 was prepared by Technical Committee ISO/TC 107, Metallic and other inorganic coatin
12、gs, Subcommittee SC 3, Electrodeposited coatings and related finishes. BS ISO 22779:2006vIntroduction Aluminium coatings may be applied to a variety of substrates by physical vapour-deposition techniques to improve resistance to corrosion, as an alternative to cadmium, and to provide dissimilar meta
13、l compatibility. The vapour-deposition process does not introduce hydrogen into the substrate and is, thus, especially useful for applying a corrosion-resistant aluminium coating to high-strength steels that are susceptible to hydrogen embrittlement. Hydrogen, however, may still be introduced into t
14、he substrate during fabrication, cleaning, pickling and other treatments, and care must be exercised to prevent hydrogen from being introduced prior to vapour deposition. The corrosion resistance of physical vapour-deposited aluminium coated articles may be further enhanced by applying chromate conv
15、ersion coatings, anodizing and other supplementary treatments. BS ISO 22779:2006blank1Metallic coatings Physical vapour-deposited coatings of aluminium Specification and test methods WARNING The use of this International Standard may involve hazardous materials, operations and equipment. This standa
16、rd does not address all the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices, and to determine the applicability of regulatory limitations prior to use. 1 Scope This International Standard specifies re
17、quirements for aluminium coatings applied by physical vapour-deposition techniques to mild steels, low-alloy steels, high-strength steels, corrosion-resisting steels, aluminium alloys, titanium alloys and other materials, as appropriate. Physical vapour-deposited coatings of aluminium are not suitab
18、le for steels having tensile strengths greater than 1 400 MPa, because of the possibility of hydrogen embrittlement due to corrosion in service or storage, or as a result of excessive cathodic protection. 2 Normative references The following referenced documents are indispensable for the application
19、 of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1463, Metallic and oxide coatings Measurement of coating thickness Microscopical method ISO 2064, Metallic and other
20、inorganic coatings Definitions and conventions concerning the measurement of thickness ISO 2080, Electroplating and related processes Vocabulary ISO 2360, Non-conductive coatings on non-magnetic electrically conductive basis materials Measurement of coating thickness Amplitude-sensitive eddy-current
21、 method ISO 2819, Metallic coatings on metallic substrates Electrodeposited and chemically deposited coatings Review of methods available for testing adhesion ISO 2859 (all parts), Sampling procedures for inspection by attributes ISO 3497, Metallic coatings Measurement of coating thickness X-ray spe
22、ctrometric methods ISO 3543, Metallic and non-metallic coatings Measurement of thickness Beta backscatter method ISO 3882, Metallic and other inorganic coatings Review of methods of measurement of thickness ISO 3892, Conversion coatings on metallic materials Determination of coating mass per unit ar
23、ea Gravimetric methods ISO 4518, Metallic coatings Measurement of coating thickness Profilometric method BS ISO 22779:20062 ISO 4519, Electrodeposited metallic coatings and related finishes Sampling procedures for inspection by attributes ISO 9220, Metallic coatings Measurement of coating thickness
24、Scanning electron microscope method ISO 9227, Corrosion tests in artificial atmospheres Salt spray tests ISO 9587, Metallic and other inorganic coatings Pretreatments of iron or steel to reduce the risk of hydrogen embrittlement ISO 9588, Metallic and other inorganic coatings Post-coating treatments
25、 of iron or steel to reduce the risk of hydrogen embrittlement ISO 10074, Specification for hard anodic oxidation coatings on aluminium and its alloys ISO 10546, Chemical conversion coatings Rinsed and non-rinsed chromate conversion coatings on aluminium and aluminium alloys ISO 12686, Metallic and
26、other inorganic coatings Automated controlled shot-peening of metallic articles prior to nickel, autocatalytic nickel or chromium plating, or as a final finish ISO 16348, Metallic and other inorganic coatings Definitions and conventions concerning appearance EN 12508, Corrosion protection of metal a
27、nd alloys Surface treatment, metallic, and other inorganic coatings Vocabulary IEC 60454, Specifications for pressure-sensitive adhesive tapes for electrical purposes Part 2: Methods of test 3 Terms and definitions For the purposes of this document, the terms and definitions in ISO 2064, ISO 2080, I
28、SO 2859, ISO 4519 and EN 12508 apply. 4 Information to be supplied by the purchaser to the processor When ordering articles for physical vapour deposition of aluminium in accordance with this International Standard, the purchaser shall provide the following information in writing in the contract or
29、purchase order, or in the engineering drawing: a) the designation (see Clause 5); b) the specification and metallurgical condition of the basis metal, any process-temperature limitations see 6.1.2 f) and shot-peening requirements see 6.1.3 c); c) the significant surface, including the coating of hol
30、es, recesses and presence of rack marks (see 6.1 and 6.3.1); d) details of any sensitive material and whether ultra-high-purity argon is required (see 6.1.2); e) the requirement for any consolidation, for example, by glass-bead peening (see 6.4.1); f) the requirement for coating thickness (see 5.4 a
31、nd Table 1) and for a chromate conversion coating (see 5.5 and 6.4.2); g) the requirement for abrasion-resistant anodic oxide coating (see 6.4.3) BS ISO 22779:20063h) the requirement for a supplementary treatment, such as paint, and details of the specification for the organic finish (see 5.5 and 6.
32、4.4); i) the requirement for coating adhesion (see 6.3.3 and Annex C). j) the requirement for special test specimens and for the type of test method, for example, destructive or non-destructive (see 6.6); k) sampling and inspection requirements (see Clause 7 and Annex D). 5 Designation The designati
33、on shall appear on engineering drawings, in the purchase order, the contract or in the detailed product specification. The designation specifies the basis material, the requirements for stress relief before vapour deposition, the nominal composition and thickness of the vapour-deposited aluminium co
34、ating, the type of chromate conversion coating and other supplementary treatment, and the heat treatment to reduce susceptibility to hydrogen embrittlement. 5.1 General The designation shall comprise the following: a) the term: vapour-deposited coating; b) the number of this International Standard,
35、ISO 22779; c) a hyphen; d) the chemical symbol of the basis metal; e) a stroke (/); f) symbols for the aluminium coating, as well as any coatings that may be applied prior to and after deposition, separated by strokes for each stage in the coating sequence in the order of application. The coating de
36、signation shall include the thickness of the coating, in micrometres. 5.2 Basis metal The basis metal shall be designated by its chemical symbol, or its principal constituent, if it is an alloy. For example: Fe for iron and steel; Zn for zinc alloys; Cu for copper and copper alloys, Al for aluminium
37、 and aluminium alloys; Ti for titanium and titanium alloys. The specific alloy may be identified by its standard designation (for example, its UNS number, or its national or regional equivalent) placed between the symbols, , for example, Fe. See Reference 4 in the Bibliography. BS ISO 22779:20064 5.
38、3 Pre-process stress-relief heat treatment Stress-relief heat treatment prior to coating may be required for some basis materials. Brackets shall be placed around the letters SR, the temperature in degrees Celsius and the time in hours. The temperature shall be in parentheses after the letters SR; f
39、or example SR(210)1. 5.4 Type and thickness of aluminium The aluminium coating shall be designated by its chemical symbol, Al, followed by a number giving the minimum local thickness of the coating, in micrometres. For example, Al10, designates an aluminium coating that is 10 m thick. The thickness
40、of vapour-deposited aluminium coatings shall be in accordance with Table 1. Allowances for the thickness of the aluminium coating should be made by adjusting the dimensional tolerances during the manufacture of threaded items, and those with close tolerances. Table 1 Minimum thickness requirements f
41、or physical vapour-deposited aluminium coatings Application Minimum local thickness m General-purpose coatings for corrosion protection and outdoor use. 25 and greater Coatings for corrosion protection in indoor applications, or where dimensional tolerances will not allow the application of a coatin
42、g with a minimum thickness of 25 m. 13 to 1,5 u 0,5 to u 1,0 aChromium in hexavalent form may or may not be present. bB is a two-stage process. BS ISO 22779:20065Table 3 Supplementary treatments other than conversion coatings Code Type of treatment T1 T2 T3 T4 T5 T6 Application of paints, varnishes,
43、 powder coatings or similar coating materials Application of organic or inorganic sealants. Dyeing Application of grease or oil, or other lubricants Application of wax Hard anodizing (see ISO 10074) NOTE The function of chromate conversion coatings and other supplementary treatments is to retard or
44、prevent the formation of white corrosion products on surfaces exposed to corrosive atmospheres, and to delay the appearance of red corrosion of aluminium coatings on steel. The iridescent yellow to olive drab chromate films are satisfactory for the application of subsequent paint coatings, but bleac
45、hed or leached chromate films are not recommended as a supplementary finish with vapour-deposited aluminium coatings. Chemical conversion coatings that do not contain hexavalent chromium are commercially available. Some contain trivalent chromium; others are chromium-free. Substitutes shall meet the
46、 corrosion requirements given in Table 4. 5.6 Post-coating heat treatment Heat treatment to reduce the susceptibility of high-strength steels to hydrogen embrittlement may be required in some circumstances (see Clause 8). Brackets shall be placed around the letters ER, the temperature in degrees Cel
47、sius and the time in hours. The temperature shall be in parentheses after the letters ER; for example ER(400)12. 5.7 Examples of coating designations Example of a physical vapour-deposited aluminium coating 8 m thick on steel (Fe), with a supplementary chromate conversion coating that is iridescent
48、yellow (C): Physical vapour-deposited coating ISO 22779 Fe/Al8/C Example of a coating 5 m thick on steel, with a supplementary chromate conversion coating that is transparent or colourless (A) and that shall receive a subsequent organic sealant (T2): Physical vapour-deposited coating ISO 22779 Fe/Al
49、5/A/T2 Example of a coating on high-strength steel that is to be stress relieved at 150 C for 2 h before applying an aluminium coating 25 m thick, that is to be hard anodized (T6): Physical vapour-deposited coating ISO 22779 Fe/SR(150)2/Al25/T6 6 Requirements 6.1 General 6.1.1 Basis metal This International Standard does not specify requirements for the condition, finish and surface roughness of the basis metal prior to physical vapo
